EP1860795A2 - Procédé destiné à la distribution de ressources dynamiques dans un système multimédia interactif en réseau radio satellite et utilisation du procédé - Google Patents

Procédé destiné à la distribution de ressources dynamiques dans un système multimédia interactif en réseau radio satellite et utilisation du procédé Download PDF

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Publication number
EP1860795A2
EP1860795A2 EP07009365A EP07009365A EP1860795A2 EP 1860795 A2 EP1860795 A2 EP 1860795A2 EP 07009365 A EP07009365 A EP 07009365A EP 07009365 A EP07009365 A EP 07009365A EP 1860795 A2 EP1860795 A2 EP 1860795A2
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Prior art keywords
requests
algorithm
capacity
allocation
requirements
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Granted
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EP07009365A
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German (de)
English (en)
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EP1860795A3 (fr
EP1860795B1 (fr
Inventor
Christian Kissling
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Deutsches Zentrum fuer Luft und Raumfahrt eV
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Deutsches Zentrum fuer Luft und Raumfahrt eV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/18582—Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]

Definitions

  • the invention relates to a dynamic resource allocation method in an interactive satellite broadcast network multimedia system with allocation of time slots in the MF-TDMA (Multi-Frequency Time Division Multiple Access) technique reverse channel by means of a dynamic resource allocation manager, all incoming requests sent by entities Those who wish to transmit data over the satellite radio network to other entities or to a central gateway, are managed to allocate bandwidth taking into account characteristics and claims-containing information.
  • MF-TDMA Multi-Frequency Time Division Multiple Access
  • the problem addressed by the present invention arises from the following relationship: When transmitting data in the reverse channel of a satellite radio link, the available resources must be managed, distributed, and optimized for their utilization. As this happens, several constraints must be met, such as Obtaining QoS (Quality of Service) criteria (delay, delay jitter, drop, etc.), bandwidth distribution neutrality, and channel channel conditions.
  • QoS Quality of Service
  • ACM Adaptive Coding and Modulation
  • FMT Fading Mitigation Technique
  • Adaptive Coding and Modulation is a method of data transmission in which the receiver provides feedback on the quality of the received data and thus on the transmission channel conditions and on which to apply Adjusts data coding and data modulation of the data transmission channel.
  • This algorithm is designed to carry out reservations for carriers and is shown schematically in flow chart form in FIG.
  • a request has been assigned to a carrier, then the entire carrier is reserved for assignments belonging to the same terminal. If no empty carrier is available, a so-called unreserved channel is searched for. This is essentially a bearer that was previously reserved but went into the unreserved state and is thus open to various terminals. If such an unreserved carrier is available and has enough space, the request is assigned here. Otherwise a search is made for a reserved channel that has enough space, starting with a carrier that has the least load. If such a reserved bearer exists, it is considered as unreserved and the request is assigned.
  • a dynamic resource allocation method in which time slots are allocated in a return channel in MF-TDMA (Multi-Frequency Time Division Multiple Access) mode to achieve maximum data throughput. For this, first, a request amount of resource corresponding to each of the terminals is accumulated during a superframe period. The accumulated request quantity of resource is then included in the superframe Frame pairs are shared and a result sum from the division and rounding of the remainder of the split to the nearest integer is recorded as a resource request set. Finally, an optimal allocation amount is decided on the basis of the retained resource request amount, and a time slot to be allocated to each of the terminals based on the optimal allocation amount is determined.
  • MF-TDMA Multi-Frequency Time Division Multiple Access
  • the application of an on-line algorithm also reduces the potential performance of the system, as the allocation decisions are not based on the full knowledge of the requirement situation, but rather on a step-by-step basis. For this reason, the situation may arise that one of the step-wise decisions results in an assignment that is suboptimal, but that is only recognized at the end of the assignment round and can not be corrected.
  • the use of bandwidth is suboptimal in these cases. In case the available bandwidth is insufficient to service all requests, the pursued strategy is to drop the request. This process presents Also, there is a loss of available bandwidth and may cause problems with compliance with the QoS criteria because data packets are dropped, ie ejected.
  • An intelligent conflict resolution mechanism could optimize the overall use of bandwidth as well as the neutrality and compliance with QoS criteria.
  • a dynamic resource allocation method useful for MF-TDMA is known.
  • the connection access control allocates static resources to all virtual connections or connection groups and also books dynamic resources if virtual connections or connection groups require guaranteed dynamic resources.
  • the bandwidth request controller allocates dynamic resources to dynamic resources requesting virtual links in such a way that dynamic resources are dynamically allocated to dynamic resource requesting virtual links up to at least that guaranteed dynamic resource share by the integrated link access controller for them booked and set in an allocation table.
  • the object of the present invention is to provide a method for dynamic resource allocation in an interactive satellite radio network multimedia system, which for the transmission in the reverse channel, the distribution of bandwidth among different terminals with consideration of ACM (Adaptive Coding and Modulation) as a fading reduction technology, the acquisition Limits to QoS (Quality of Service) and managed an optimization of delivered throughput and neutrality.
  • ACM Adaptive Coding and Modulation
  • QoS Quality of Service
  • an arbitration scheme is to be offered which resolves this conflict in a manner that takes into account both throughput efficiency and QoS needs and the neutrality of the bandwidth distribution.
  • the dynamic resource allocation manager calculates an information-obeying burst schedule such that a dynamic mapping of ModCodes (modulation and modulation) Coding rate sets) into the time slots of a superframe, respectively, by means of an architecture following a successive calculation strategy, depending on the load of the requests, whether a request conflict resolution algorithm is to be applied or if there is a direct allocation, that the creation of the burst Timing takes into account the constraint that, to avoid parallelism, only one timeslot may be allocated at the same time in one of the different bearers, and consequently the other bearers must not have time slot assignment at the same time
  • RBDC rate-based requirements
  • VBDC volume based dynamic capacity
  • the overall process of allocation and distribution of resources is advantageously carried out in a central gateway.
  • the system may include a transparent or regenerative satellite. Due to the availability of a forward channel (DVB-S2) and a reverse channel (DVB-RCS), a variety of different services, e.g. Voice over IP (VoIP), video streaming, audio streaming, Internet traffic, File Transfer Protocol (FTP), e-mail, etc. are supplied.
  • VoIP Voice over IP
  • 2 schematically shows such an overall system with several terminals 1, 2, 3 equipped in each case with a parabolic antenna and a gateway (gateway) 4 equipped with a ground station antenna at the ground 5 and a communications satellite 6.
  • QoS quality of service
  • the bandwidth requirement varies even for a constant bit rate request depending on the channel state. For example, the bandwidth requirement increases as the channel state changes from a clear sky condition to a rainfall channel, as the applied coding increases and the modulation level decreases.
  • the second reason for changing the required bandwidth is the variation in overall traffic generated within a RCS (Return Channel for Satellite) terminal.
  • the changing bandwidth needs caused by these effects must be managed and optimized for an MF-TDMA scheme.
  • the Resource Allocator (RA) in the reverse channel is subject to some special constraints, which must be taken into account additionally. Since an RCS terminal is considered which should contain only one modulator, it is not possible to transmit simultaneously on two different carriers. This important limitation must be taken into account when allocating time slots and carriers within the resource allocator (RA).
  • the transmission in the RCS reverse channel is organized in so-called superframes (SF).
  • SF superframes
  • a superframe is defined by a set of frequencies and time.
  • the superframe is then divided into carriers and timeslots.
  • An example of a superframe is shown in FIG.
  • the superframe example shown in Fig. 3 consists of three carriers with different bandwidths. Both the duration of the time slots and the number of carriers and the bandwidth allocated to each carrier are completely flexible.
  • MC modulation and coding
  • the method of the present invention uses dynamic mapping.
  • Dynamic mapping means that the assignment of a modulation and coding (MC) occurs at a time slot for a single superframe. The mapping can be completely different for the next superframe. To take advantage of this high level of adaptation, several things need to be considered.
  • the method according to the present invention can be used particularly advantageously in the field of mobile satellite radio communication, whereby the QoS criteria are met in the transmission.
  • the architecture proposed by the present invention can handle both different timeslot lengths and different carrier symbol rates within a superframe.
  • FIG. 1 A flow chart for the algorithm used for dynamic mapping according to the present invention is shown in FIG.
  • the Resource Allocation (RA) process is divided into "rounds of grants".
  • RRT resource request table
  • rate-based and volume-based requirements are to favor rate-based requirements, which are usually severely constrained in terms of delay and delay jitter, over volume-based requirements, e.g. http, email, ftp, ..., at the later processing executed.
  • the duration of an allocation round is identical to the duration of a superframe.
  • the time and frequency structure is fixed in the dynamic scenario, but the ModCods can be individually assigned to a timeslot via the Terminal Burst Time Plan (TBTP) schedule, which is transmitted separately for each Superframe SF , For this reason, it is necessary to calculate the number of symbols requiring a specific request. This amount depends on the actual channel conditions.
  • the Resource Allocation Algorithm (RAA) mechanism makes an initial check as to whether there is any possibility that all requests can be serviced. The requirements can be executed per procedure or accumulated per terminal.
  • the resource allocation algorithm must summarize all per-procedure requests at the per-terminal level in order to be able to search for parallel timeslot allocation that is not allowed.
  • the first estimate of a possible fit is made here to reduce the overall computational complexity of the allotment algorithm.
  • the computational load decreases because in situations where all requests can be serviced no application of a conflict resolution algorithm is necessary.
  • the application of the conflict resolution algorithm would only lead to the same result as a direct allocation, so that this computing time can be saved.
  • RBDC rate-based
  • a second calculation of the capacity required for all RBDC requests is performed. This prioritization occurs because it is far more urgent to meet the timing and throughput criteria for RBDC operations (e.g., VoIP) than for volume based operations (e.g., FTP).
  • RBDC operations e.g., VoIP
  • volume based operations e.g., FTP
  • bin-packing is again applied to check if the capacity in a superframe can actually be allocated. This is done in the same way as described in the previous section. If possible, the excess time slots are distributed among all remaining VBDC requests.
  • the method of the present invention is advantageously applicable in conjunction with a system architecture that manages forward and reverse channel transmission as part of DVB-S2 (forward channel) and DVB-RCS (reverse channel) using ACM (Adaptive Coding and Modulation) as a fade mitigation technique. Examples of such applications are shown schematically in FIG.
  • a geostationary satellite 7 is used to illuminate a large geographical area on the surface of the earth, which is subdivided into beams.
  • the central gateway 8 shown in Fig. 5 includes the dynamic resource allocation mechanism shown in Fig. 4 as a flow chart. All ground terminals 9, 10, 11 within a beam are scheduled by the same burst timeline instructing which terminal 9, 10, 11 will be allowed to transmit at what time, at what center frequency, and at what bandwidth. For each new session, e.g. VoIP session or a web page, sends the terminal 9 or 10 or 11 via its reverse channel RCS in the way via the satellite 7, a capacity request to the gateway 8th
  • this request will be a request for rate-based capacity RBDC (eg, constant bit rate VoIP) or volume-based capacity VBDC (eg, Internet with no strict delay and delay jitter requests, but specific volume).
  • RBDC rate-based capacity
  • VBDC volume-based capacity
  • the gateway 8 also collects information about the actual channel conditions of all participating terminals 9, 10, 11 and stores them in their databases.
  • the transmission in the reverse channel RCS is in superframes, eg organized by a period of 50 ms. This period also determines the length of an allotment round.
  • the resource dispatcher stores all incoming requests in an internal database and separates them for RBDC and VBDC requests. If the amount of required capacity does not exceed the available capacity, a bin-packing algorithm is applied to make optimum use of capacity when the transmission burst schedule is prepared.
  • the WFD (Worst Fit Decreasing) algorithm is a good choice for the bin-packing algorithm because it results in an equal distribution of terminals per carrier and a uniform distribution of excess capacity among all carriers. But in general, any bin-packing algorithm could be used. This excess capacity can then simply be allocated to all terminals on the same carrier as excess capacity, without the need for carrier hopping.
  • RBDC and VBDC requests are allocated time slots using, for example, a WFD (Worst Fit Decreasing) algorithm.
  • WFD Wide Fit Decreasing
  • a conflict resolution algorithm can be applied, such as weighted proportional allocation (assignment proportional to the size of the requirement for all requests) or proportional fair allocation (assignment based on of channel conditions, Buffer state and neutrality in the past).
  • the conflict resolution algorithm will be applied to this request type.
  • several different algorithms can be used, such as e.g. Weighted Proportional Allocation or Proportional Fair Allocation.
  • Any excess capacity is then distributed among all terminals on the same carrier according to an excess capacity distribution algorithm to avoid carrier hopping.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
EP07009365A 2006-05-26 2007-05-10 Procédé destiné à la distribution de ressources dynamiques dans un système multimédia interactif en réseau radio satellite et utilisation du procédé Not-in-force EP1860795B1 (fr)

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DE102006025038A DE102006025038B4 (de) 2006-05-26 2006-05-26 Verfahren zur dynamischen Ressourcenzuteilung in einem interaktiven Satellitenfunknetz-Multimediasystem und Verwendung des Verfahrens

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EP1860795A2 true EP1860795A2 (fr) 2007-11-28
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104010374A (zh) * 2013-02-21 2014-08-27 京信通信系统（中国）有限公司 一种进行业务调度的方法及装置
EP2615745A3 (fr) * 2012-01-16 2014-10-01 The Boeing Company Informations de routage dans un réseau de séparateur-combineur de blocage
CN105391491A (zh) * 2015-11-17 2016-03-09 北京邮电大学 一种应用于卫星通信系统的带宽分配方法及系统
CN105743562A (zh) * 2016-03-21 2016-07-06 南京邮电大学 基于预测动态带宽分配的卫星网络接入方法
CN110198563A (zh) * 2018-02-26 2019-09-03 中兴通讯股份有限公司 卫星通讯系统中反向自适应调度方法及通信设备
CN113068267A (zh) * 2021-04-02 2021-07-02 中科天智运控(深圳)科技有限公司 一种通信卫星信道带宽资源动态分配方法及装置
CN114553301A (zh) * 2022-02-22 2022-05-27 北京国电高科科技有限公司 一种卫星通讯方法、卫星以及通讯设备
FR3118384A1 (fr) * 2020-12-23 2022-06-24 Thales Forme d'onde a resilience adaptative
CN115226228A (zh) * 2022-08-30 2022-10-21 成都星联芯通科技有限公司 时隙分配方法、装置、主站设备及存储介质

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CN116208236B (zh) * 2023-04-25 2023-07-07 中科星图测控技术股份有限公司 一种sar卫星星座任务规划方法

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2615745A3 (fr) * 2012-01-16 2014-10-01 The Boeing Company Informations de routage dans un réseau de séparateur-combineur de blocage
US9363009B2 (en) 2012-01-16 2016-06-07 The Boeing Company Routing information through a blocking splitter-combiner network
CN104010374A (zh) * 2013-02-21 2014-08-27 京信通信系统（中国）有限公司 一种进行业务调度的方法及装置
CN104010374B (zh) * 2013-02-21 2018-09-25 京信通信系统（中国）有限公司 一种进行业务调度的方法及装置
CN105391491A (zh) * 2015-11-17 2016-03-09 北京邮电大学 一种应用于卫星通信系统的带宽分配方法及系统
CN105743562A (zh) * 2016-03-21 2016-07-06 南京邮电大学 基于预测动态带宽分配的卫星网络接入方法
CN110198563A (zh) * 2018-02-26 2019-09-03 中兴通讯股份有限公司 卫星通讯系统中反向自适应调度方法及通信设备
CN110198563B (zh) * 2018-02-26 2022-08-16 中兴通讯股份有限公司 卫星通讯系统中反向自适应调度方法及通信设备
FR3118384A1 (fr) * 2020-12-23 2022-06-24 Thales Forme d'onde a resilience adaptative
EP4020836A1 (fr) * 2020-12-23 2022-06-29 Thales Forme d'onde à résilience adaptative
CN113068267A (zh) * 2021-04-02 2021-07-02 中科天智运控(深圳)科技有限公司 一种通信卫星信道带宽资源动态分配方法及装置
CN113068267B (zh) * 2021-04-02 2023-03-24 中科天智运控(深圳)科技有限公司 一种通信卫星信道带宽资源动态分配方法及装置
CN114553301A (zh) * 2022-02-22 2022-05-27 北京国电高科科技有限公司 一种卫星通讯方法、卫星以及通讯设备
CN115226228A (zh) * 2022-08-30 2022-10-21 成都星联芯通科技有限公司 时隙分配方法、装置、主站设备及存储介质
CN115226228B (zh) * 2022-08-30 2022-11-22 成都星联芯通科技有限公司 时隙分配方法、装置、主站设备及存储介质

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Publication number Publication date
DE102006025038B4 (de) 2008-04-03
ATE459139T1 (de) 2010-03-15
EP1860795A3 (fr) 2008-05-28
DE102006025038A1 (de) 2007-11-29
EP1860795B1 (fr) 2010-02-24
DE502007002895D1 (de) 2010-04-08

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